I do not see any legal complications with the OC of both long guns and a sidearm.
HOWEVER, I also would like to make it plainly clear that whether Open Carrying either longs gun or sidearms, you are displaying something which is offensive to some people, and will invoke a response of some variety. Bringing awareness to the rights of it citizens is an American Duty, and should be taken seriously.
You know as well as I do, that if you OC an AR and have an H&K to accessorize, you are going to get stopped. It will at that point completely be at the discretion of the officer as to what happens from there...
-ME + Keller